Question

what you mean by black body

Answer 1

An object that absorbs all radiation falling on it, at all wavelengths, is called a black body. When a black body is at a uniform temperature, its emission has a characteristic frequency distribution that depends on the temperature. Its emission is called black-body radiation.

hope it clarifies ur doubt dear friend..

Answer 2

A blackbody (sometimes spelled "black body") is a theoretically ideal radiator and absorber of energy at all electromagnetic wavelength s. The term comes from the fact that a coldblackbody appears visually black. The energy emitted by a blackbody is called blackbody radiation.